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A framework is presented for including second-order perturbative corrections to the radiation patterns of parton showers. The formalism allows to combine O(αs2)-corrected iterated 2→3 kernels for “ordered” gluon emissions with tree-level 2→4 kernels for “unordered” ones. The combined Sudakov evolution kernel is thus accurate to O(αs2). As a first step towards a full-fledged implementation of these...
To clarify the electroweak symmetry breaking mechanism, we need to probe the Higgs self-couplings, which can be measured in Higgs pair productions. The associated production with a vector boson is special due to a clear tag in the final state. We perform a fully differential next-to-next-to-leading-order calculation of the Higgs pair production in association with a W boson at hadron colliders, and...
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